JP2010010945A - Bone conduction microphone-speaker communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bone conduction microphone-speaker communication apparatus with a bone conduction microphone capable of efficiently capturing bone conduction sound and converting it to sound data without capturing surrounding noise, thereby eliminating the need of another apparatus, and achieving a light-weight cableless communication apparatus even when a radio function is added. <P>SOLUTION: The bone conduction microphone-speaker communication apparatus includes the bone conduction microphone 11 comprising a pair of right and left bone conduction drivers to be abutted to the periphery of ears, a bone conduction speaker 12, a radio unit 13 which can be connected to a remote controller 9, and a control part 14 of a sound processing means to output sound signals received from the remote controller 9 to the bone conduction speaker 12 and transmitting the sound signals received from the bone conduction microphone 11 to the remote controller 9. The bone conduction driver incluldes a base where a recess is formed, a voice coil stored in the recess, a diaphragm attached to a fixing part configuring the inner wall of the recess and disposed over the upper side of the voice coil, a magnet attached to the upper surface center of the diaphragm, and a lid attached to the upper part of the base. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bone conduction microphone / speaker communication device that is mounted on a user's head and transmits / receives audio data to / from a communication device main body or a remote control device side thereof, and more specifically, without capturing ambient noise, The present invention relates to a bone-conduction microphone / speaker communication device including a bone-conduction microphone that can efficiently capture and convert sound conduction into voice data.

  As this type of bone conduction microphone / speaker communication device, conventionally, a bone conduction speaker arranged to contact the periphery of the ear, and a bone conduction microphone arranged to contact any position of the head, And holding means for holding the bone-conducting speaker and the bone-conducting microphone in the position. The holding means includes a side belt that surrounds the head from both sides to the back of the head, and a head attached to the side belt. A bone-conducting headset comprising a head belt surrounding the top has been proposed (see, for example, Patent Document 1).

  However, in the conventional bone conduction microphone / speaker communication device, an acceleration pickup microphone is particularly used as a bone conduction microphone. Although the microphone can capture and convert minute vibrations, a DSP device for amplifying the microphone is required separately. In addition, such an acceleration pickup microphone clearly captures ambient noise and requires processing such as noise reduction.

  On the other hand, such a bone conduction microphone / speaker communication device is used to allow users to make hands-free calls when using such portable telephones in special occupations such as industrial sites, transportation, police, and security. The one that uses a headset, fixes the body of the portable phone to the waist, etc., and is provided with a PTT button on the cable that connects the headset and the body of the portable phone. The presence of the cable has problems such as obstructing the work, failure due to the cable disconnection, and the work becoming dangerous due to being entangled with the arm or body.

  However, in the conventional bone conduction microphone / speaker communication device, since the noise problem and the DSP device are separately required as described above, in order to reduce the weight of the communication device itself, the cable is connected to the main body of the communication device, It is necessary not to add a separate device as much as possible to the communication device. Therefore, as a cableless communication apparatus, conventionally, a microphone having a normal microphone while having a bone conduction speaker has been the mainstream. However, such a normal microphone has a problem from the viewpoint of waterproofing and drip-proofing that can cope with heavy rain. As a bone conduction driver conventionally used as a bone conduction speaker, a voice coil is attached to the central magnetic pole of the yoke, the magnet is arranged on the short side end portions on both sides of the yoke, and the magnet on the magnet arrangement axis Although it is conceivable to use a bone conduction speaker (see, for example, Patent Document 2) in which a diaphragm fixing portion is arranged outside each magnet as a microphone, the conversion efficiency is not sufficient and it is not used as a microphone. The conversion efficiency is better than that, and a small and light weight is required.

Japanese Patent Laid-Open No. 11-215581 JP 2006-33787 A

  Therefore, in view of the above-mentioned situation, the present invention intends to solve the problem by having a bone conduction microphone that can efficiently capture bone conduction sound and convert it into voice data without capturing ambient noise, thereby separately providing a device. Therefore, there is a need to provide a bone conduction microphone / speaker communication device that can realize a lightweight cableless communication device even if a wireless function is added.

  In order to solve the above-mentioned problems, the present invention is a bone conduction microphone / speaker communication device that is worn on the user's head and transmits / receives audio data to / from the communication device main body or its remote control device side. Short distance for transmitting and receiving audio data between the bone conduction microphone and bone conduction speaker comprising one or a pair of left and right bone conduction drivers arranged so as to contact the periphery, and the side of the communication device or its remote control device A wireless communication unit and a voice signal received from the main body of the telephone or its remote control device through a short-range wireless communication unit are output to a bone conduction speaker, and a voice signal received from a bone conduction microphone is transmitted through the short-range wireless communication unit. A bone conduction driver including at least a voice processing means for transmitting to the main body or the remote control device side, and functioning as a bone conduction microphone A base in which a recess having a substantially circular bottom surface is formed, a voice coil accommodated in the recess, and a voice that is attached to the fixed portion constituting the inner wall of the recess in the base and is accommodated in the recess A diaphragm provided on the upper side of the coil, a magnet attached at a substantially central position on the upper surface side of the diaphragm, a metal cover disposed above the magnet, and provided above the metal cover And a bone conduction microphone / speaker communication device characterized in that the device is composed of a lid body.

  Here, of the pair of left and right bone conduction drivers, one functions as a bone conduction microphone, the other functions as a bone conduction speaker, and the other bone conduction driver that functions as the bone conduction speaker functions as a bone conduction microphone. Those having the same structure as those of the bone conduction driver are preferred.

  Alternatively, it is also preferable to switch the one bone conduction driver to a bone conduction microphone / bone conduction speaker to function.

  Further, as a specific structure of the bone conduction driver, a pole screw protruding upward from a substantially central portion of the bottom surface of the recess is provided integrally with the base using a metal material, and the voice coil is disposed around the pole screw. In addition, it is preferable that the inner wall surface of the recess is formed in a curved surface substantially parallel to the outer peripheral surface of the voice coil accommodated.

  Further, it is preferable that a pair of the fixing portions are provided at positions facing each other with the concave portion interposed therebetween, and both end portions of the diaphragm are fixed to the upper surface of each fixing portion.

  According to the present invention as described above, a base having a recess having a substantially circular bottom as a bone conduction driver, a voice coil housed in the recess, and an inner wall of the recess in the base are configured. A diaphragm that is attached to the fixed portion that is mounted on the upper side of the voice coil housed in the recess, a magnet that is attached at a substantially central position on the upper surface side of the diaphragm, and that is disposed on the upper side of the magnet. And a lid provided on the upper side of the metal cover, and having a structure that can efficiently capture bone conduction sound and convert it into audio data, the amplification device A separate device such as a noise-cutting device or a noise-cutting device is not required, and a wireless and wireless cable-less bone conduction microphone / speaker communication device with a waterproof function can be obtained. . In particular, since the magnet is mounted at the center position on the upper surface of the diaphragm, the magnet vibrates directly, and the magnetic flux change is transmitted directly to the voice coil. Since an efficient magnetic flux circuit for guiding the magnetic flux to the side can be formed, the electrical signal / vibration conversion efficiency is extremely excellent, and it can be sufficiently used as a bone conduction microphone as well as a bone conduction speaker.

  In addition, one of the pair of left and right bone conduction drivers, one bone functions as a bone conduction microphone and the other functions as a bone conduction speaker, and the other bone conduction driver that functions as the bone conduction speaker functions as one bone conduction microphone. If it has the same structure as the conduction driver, parts management and manufacturing costs can be greatly reduced.

  In addition, if one bone conduction driver is switched to a bone conduction microphone / bone conduction speaker to function, it can sufficiently handle simplex-type calls, and can achieve significant weight reduction and cost reduction.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an explanatory view showing a hands-free call system S using a bone conduction microphone / speaker call device according to the present invention. FIGS. 1 to 10 show the first embodiment, and FIGS. 11 and 12 show the second embodiment. In the figure, reference numeral 1 denotes a bone conduction microphone / speaker communication device, 8 denotes a portable communication device body, and 9 denotes a PTT remote control device.

  In the following hands-free call system S, an example in which a portable caller body is used will be described. However, the present invention is not limited to this, and voice is exchanged with an installed caller body such as an in-vehicle wireless device. Of course, it is also possible to send and receive data. In addition, as a unit used for short-range wireless communication, a licenseless 2.4 GHz ISM (Industrial Scientific Medical) band is used, and an example using a low-cost Bluetooth (registered trademark) wireless unit is given. However, various systems such as those provided with an “IrDA” system infrared data communication module can be adopted depending on the use situation.

  As shown in FIG. 1, the hands-free call system S according to the present embodiment includes a portable communication device body 8 having a simplex communication function for switching a transmission / reception state and making a call, and the portable communication device body 8. And a PTT remote control device 9 for transmitting a PTT signal for switching the transmission / reception state by pressing the PTT button 91 to the portable telephone main unit 8, and the PTT remote control device 9 and a cable or a short-range wireless communication. And a bone conduction microphone / speaker communication device 1 according to the present invention connected through a communication unit. As shown in FIG. 9, in the hands-free call system S, the PTT remote control device 9 is attached to an appropriate part of the body while the portable telephone body 8 is in a pocket or a bag, for example, and a PTT button is operated. Thus, it is possible to make a call without obstructing the cable.

  The bone conduction microphone / speaker communication device 1 is mounted on the user's head and transmits / receives voice data to / from the communication device main body 8 or its remote control device 9 side. As shown in FIG. A Bluetooth wireless unit 13 connectable between a bone conduction microphone 11, a bone conduction speaker 12, and a PTT remote control device 9, which are a pair of left and right bone conduction drivers arranged so as to be in contact with the periphery (the temporal region in front of the ear). The audio signal received from the PTT remote control device 9 via the Bluetooth wireless unit 13 is output to the bone conduction speaker 12, and the audio signal received from the bone conduction microphone 11 is transmitted from the Bluetooth wireless unit 13 to the PTT remote control device 9. A control unit 14 having an audio processing unit 14a as an audio processing unit is provided. The Bluetooth wireless unit 13 of the bone conduction microphone / speaker communication device 1 and the Bluetooth wireless unit 90 of the PTT remote control device 9 are paired in advance by a profile before use.

  In this example, a headset type in which a bone conduction microphone 11 and a bone conduction speaker 12 are provided at both right and left ends of the headband 15 is illustrated, and the control unit 14 including the Bluetooth wireless unit 13 and the sound processing unit 14a It is built in substantially the center of the headband 15. However, the position of the control unit 14 and the like may be anywhere, and various types such as an ear hook type, an earphone type, and a helmet built-in type can be adopted. The bone conduction microphone 11 and the bone conduction speaker 12 are each composed of the bone conduction driver 10 having the same structure, thereby reducing the cost. However, it is of course possible to use a bone conduction driver of another structure for the bone conduction speaker 12 that does not require a special structure.

  Also, as shown in FIG. 10, it is also a preferred embodiment that only one bone conduction driver 10 is provided and switched to function as a bone conduction microphone 11 / bone conduction speaker 12. In this case, since one bone conduction driver 10 can be used for both functions, it is possible to greatly reduce the cost and weight. Further, in this example, the left and right bone conduction microphones 11 and the bone conduction speaker 12 are switched and used, but both the left and right internal bone conduction drivers 10 are switched and used as the bone conduction microphone 11 and the bone conduction speaker 12 at the same time. It is also possible to use the bone conduction microphone 11 / bone conduction speaker 12 by switching the left and right at the same time. This makes it possible to make a call more reliably.

  Specifically, as shown in FIGS. 3 to 5, the structure of the bone conduction driver 10 includes a base 2 on which a recess 25 having a substantially circular bottom surface 20 is formed, and a voice coil 3 accommodated in the recess 25. A diaphragm 4 attached to the fixed portion 22 constituting the inner wall 23 of the recess 25 in the base 2 and extending over the voice coil 3 housed in the recess 25, and an upper surface side of the diaphragm 4 The magnet 5 is mounted at a substantially central position 40, a non-magnetic metal cover 6 disposed above the magnet 5, and a lid 7 provided above the metal cover 6. Yes. A pole screw 21 projecting upward is disposed at a substantially central portion of the bottom surface 20 of the recess of the base 2. The pole screw 21 is provided integrally with the base 2, and the voice coil 3 is disposed around the pole screw 21. In addition, a pair of fixing portions 22 and 22 are provided at positions facing each other across the concave portion 25 of the base 2, and the inner wall 23 of the concave portion 25 formed by the fixing portion 22 has the voice coil 3. It is formed in a curved surface having a radius slightly larger than that of the voice coil 3 so as to be stably fixed and supported.

  Both end portions 44, 44 of the diaphragm 4 are fixed to the upper surface of each fixing portion 22, so that the diaphragm 4 is installed above the concave portion 25 in which the pole screw 21 is accommodated. The height of the upper surface of the fixed portion 22 is formed to be slightly higher than the height of the upper surface of the pole screw 21. Therefore, a certain gap is formed between the diaphragm 4 and the pole screw 21 in a state where the diaphragm 4 is installed between the fixed portions 22 and 22. Thus, the base 2 has the effect of simplifying several components into one by acting as a yoke in addition to the role of fixing and supporting the voice coil 3 and the like. Thus, in order to make the pole screw 21 also serve as a yoke and to minimize the manufacturing process and the manufacturing cost, the pole screw 21 is desirably integrally formed with the base 2 using a metal material. Specifically, the metal material can be formed by cutting or casting.

  The voice coil 3 is coupled to the pole screw 21 of the base 2. Here, the thickness (height) of the voice coil 3 is set to be approximately the same as the height of the pole screw 21. Therefore, a certain gap is formed between the upper surfaces of the voice coil 3 and the pole screw 21 and the diaphragm 4. Further, both end portions of the coil wire of the voice coil 3 are extended from the bottom surface 20 to the lower surface of the base 2 and are electrically connected to a terminal 27 installed with an insulator 26 interposed as shown in FIG. Has been. A sound signal is input to the voice coil 3 through the terminal 27.

  The vibration plate 4 is formed of a substantially flat plate-like member, and has a substantially circular vibration region 4 a similar to the shape of the bottom surface 20 of the recess and a fixed region 4 b having a shape similar to the upper surface shape of the fixing portion 22. These are passed over the voice coil 3 to vibrate at a predetermined frequency while preventing the voice coil 3 from being detached. In this example, the mounting screws 43, 43 penetrating through the through holes 42, 42 formed in the fixing region 4b of the diaphragm 4 are fixed to the screw holes 24, 24 formed on the upper surfaces of the fixing portions 22, 22, respectively. By doing so, it is constructed between the upper surfaces of the fixing portions 22 and 22.

  A plurality of elongated holes 41 penetrating vertically are formed along the circumferential direction around the periphery of the vibration region 4a of the diaphragm 4, that is, around the central position 40 where the magnet 5 is attached. Thus, by forming at least one long hole 41 in the vibration region 4a, the vibration efficiency or the bone conduction efficiency of the vibration plate 4 is improved. In this example, a total of four long holes 41 are formed at vertical and horizontal symmetrical positions. However, the number of the long holes 41 may be less than four or five or more, and the arrangement thereof is also the position of each side of the triangle and the position of each side of the square. Various forms such as the position of each side of the pentagon, the position of each side of the hexagon, and the position along the circle are possible.

  The magnet 5 is a rectangular parallelepiped, is fixed at a substantially central position 40 of the vibration region 4 a on the upper surface of the diaphragm 4, and interacts with the voice coil 3 (attraction or repulsion). The magnet 5 is fixed to the inner vibration region 4a surrounded by the long holes 41,..., But this position is suitable in terms of vibration efficiency or bone conduction efficiency. The magnet 5 is preferably formed in a region corresponding to the center of the voice coil 3 or the center of the pole screw 21 in order to increase the vibration efficiency or the bone conduction efficiency. Therefore, conventionally, it has been necessary to provide a large number of magnets, but in the present invention, only one is sufficient. Of course, the number of magnets 5 is not limited at all, and two or more magnets can be used. In addition to the rectangular parallelepiped shape, a triangular prism, a cylinder, a pentagonal prism, and other various shapes can be employed.

  On the other hand, a metal cover 6 that covers from the upper surface of the magnet 5 to at least a part of the side surface thereof is provided so that the magnetic lines of force of the magnet 5 can go to the voice coil 3. The metal cover 6 is made of a metal material that cannot penetrate the magnetic force lines, for example, a non-magnetic material so that the magnetic force lines of the magnet 5 can be concentrated on the voice coil 3 side. The covering portion 62 is covered and fixed pieces 63 and 63 extending on both sides. A concave portion 70 for receiving the covering portion 62 of the metal cover 6 together with the magnet 5 is provided at a position corresponding to the magnet 5 on the inner surface of the lid body 7, and a through hole 60 drilled in the fixing piece 63 is provided. By fixing the penetrating mounting screw 61 to the screw hole 71 formed on the inner surface side of the lid body 7, the mounting screw 61 is fixed to the inner surface side.

  The bone conduction driver 10 according to this embodiment having the above structure operates as the bone conduction microphone 11 as follows. When the user speaks, the vibration is transmitted to the scalp through the skull, and the vibration is transmitted to the lid 7 of the bone conduction driver 10 in the bone conduction microphone 11. This vibration is transmitted to the metal cover 6 and the magnet 5, and the diaphragm 4 vibrates. A large number of long holes 41 are formed in the diaphragm 4 so that the magnet 5 vibrates up and down with a large width. As a result, a relatively clear current signal corresponding to the vibration of the magnet is generated in the voice coil 3 and is extracted as voice data.

  Further, the bone conduction speaker 12 operates as follows. First, when a current signal corresponding to a predetermined audio signal is transmitted to the voice coil 3, the voice coil 3 vibrates at a predetermined frequency by the magnetic force or attractive force of the magnet 5, the pole screw 21, and the inner wall 23 of the recess. The diaphragm 4 located on the upper part of the voice coil 3 is vibrated together by the vibration transmitted from the voice coil 3 via the fixed portion 22. At this time, the diaphragm 4 is formed with a large number of elongated holes 41,..., And thus vibrates with greater amplification than the voice coil 3. The vibration phenomenon of the diaphragm 4 is transmitted to the magnet 5 and the metal cover 6 mounted thereon, and is transmitted to the scalp of the human body through the lid body 7. Thereby, even a hearing-impaired person who has an abnormality in the eardrum or the ossicle in the skull of the human body can surely hear the sound if the cochlea and the auditory nerve are normal.

  In this example, the bone conduction driver 10 as the bone conduction microphone 11 and the bone conduction speaker 12 is incorporated in the cases 11a and 12a provided at both ends of the headband 15 in a state of contacting the inner surface of the case. Similarly to the second embodiment shown in FIG. 11, the lid 7 may be used as the casing of the cases 11a and 12a, and the diaphragm 4 may be directly fixed to the inner surfaces of the cases 11a and 12a.

  The portable telephone main body 8 has a conventionally known transceiver configuration. As shown in FIG. 7, an antenna 80, a transmission / reception changeover switch 81, a wireless communication circuit 82, a control unit 83, a PTT switch (PTT button on the main body side) 84), and a speaker / microphone 85 on the main body side, and a Bluetooth wireless unit 86 as a short-range wireless communication unit is provided in a Bluetooth adapter 87 to which a cable is connected from the outside via a plug. The control unit 83 includes a microcomputer that performs various processes using a program stored in the memory. The control unit 83 receives a PTT signal and switches transmission / reception, and transmits / receives an audio signal received from the wireless communication circuit to the speaker / microphone 85. An audio processing unit 83b that outputs to the wireless communication circuit 82 an audio signal that is output to the speaker and received from the microphone of the speaker / microphone 85 is provided.

  As the portable communication device body 8, a mobile phone, a PHS (Personal Handyphone System), a PDA (Personal Digital Phone) may be used as long as it has a PTT function in addition to the conventionally known portable wireless devices and transceivers. Assistant: portable information terminal), laptop computers, digital cameras, and other mobile terminals.

  As shown in FIG. 8, the PTT remote control device 9 includes a Bluetooth wireless unit 90 that can be connected to the portable telephone body 8 and a PTT switch that outputs a PTT signal for switching the transmission / reception state of the portable telephone body 8. PTT button 91) and a control unit 92, and the control unit 92 is composed of a microcomputer that performs various processes using a program stored in the memory. The PTT signal output by operating the PTT button 91 is transmitted from the Bluetooth wireless unit 90 to a portable phone call. A first audio processing unit 92b that transmits and receives audio data through the Bluetooth wireless unit 90 between the PTT signal transmission processing unit 92a that wirelessly transmits to the main unit 8 and the portable telephone main unit 8; Second audio processing for transmitting / receiving audio data to / from the speaker communication device 1 And at least a 92c. The Bluetooth wireless unit 90 of the PTT remote control device 9 and the Bluetooth wireless unit 86 of the portable telephone body 8 are paired in advance with a profile or a serial number more reliable than the profile before use.

  When the PTT button 91 is pressed on the PTT remote control device 9, the PTT signal is transmitted from the Bluetooth wireless unit 90 to the portable telephone main unit 8 by the PTT signal transmission processing unit 92 a, and the portable telephone main unit 8 is connected to the Bluetooth wireless unit 86. The transmission / reception switching processing unit 83a performs transmission / reception switching of the transmission / reception switching switch 81 in response to the PTT signal. When the user speaks from the bone conduction microphone / speaker communication device 1 in this state, the first voice processing unit 92b of the PTT remote control device 9 receives from the bone conduction microphone / speaker communication device 1 by the second voice processing unit 92c. The voice data transmitted to the portable communication device main body 8 is transmitted from the antenna 80 from the transmission / reception selector switch 81 in which the voice output from the voice processing unit 83b to the wireless communication circuit 82 is switched to the transmission side.

  When the PTT button 91 is released, the transmission / reception selector switch 81 is maintained in the reception state, and only reception is possible. When receiving voice from another telephone, the voice processing unit 83b transmits the voice data to the PTT remote control device 9 via the Bluetooth wireless unit 86, and the first voice processing unit 92b of the PTT remote control device 9 receives the voice data. Then, the second voice processing unit 92c transmits the voice data to the bone conduction microphone / speaker call device 1, and the user can hear the voice from the bone conduction microphone / speaker call device 1.

  In the present embodiment described above, the PTT remote control device 9 is provided with the first audio processing unit 92b and the second audio processing unit 92c, and the PTT remote control device 9 functions as an audio data repeater. Of course, it is also possible to directly transmit and receive audio data between the microphone / speaker call device 1 and the portable phone main unit 8.

  Next, a second embodiment of the bone conduction driver 10 will be described with reference to FIGS.

  In the bone conduction driver 10 of the present embodiment, the diaphragm 4 is configured in a substantially cross shape in plan view, and one end portions 44 and 44 facing each other across the center portion are respectively fixed to the upper surface of the fixing portion 22. A long groove 46 extending in this direction is provided between the other end portions 45 and 45 in a direction perpendicular to this, and a plate member 47 is fitted into the long groove 46 via a gap and fixed on the both end portions 45 and 45. The magnet 5 is arranged at the center position of the upper surface of the plate member 47, and the plate member 47 of the diaphragm 4 is attached to the lid body 7 by mounting screws 72, 72 with the magnet 5 being sandwiched therebetween. Fixed to the bottom surface. As a result, when the diaphragm 4 supported at both ends by the end portions 44 and 44 vibrates, the plate member 47 orthogonal to the center portion vibrates up and down, and this is transmitted to the lid body 7.

  A plate body 50 is further sandwiched between the magnet 5 and the lid body 7 as a metal cover made of a magnetic material that is long in the direction between the one end portions 44 of the diaphragm 4. The magnetism that is generated in the magnetic field is guided to the end 44 side through the plate body 50, and from there, an efficient magnetic circuit is formed that is guided to the fixed portion 22 of the lower base 2, thereby contributing to prevention of magnetic leakage and improvement of conversion efficiency. is doing. Further, in this example, the lid body 7 also serves as the case 11a / 12a, and the cases 11a and 12a are constituted by split cases 72 and 73 connected by mounting screws 74, and the split case 73 is a user's temporal region. Will abut. Thereby, vibration efficiency can be improved.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

  About the result of having measured the magnetic flux generated from the bone conduction driver 10 of Examples 1 and 2 of the present invention constituted as described above and the bone conduction driver of Comparative Examples 1 and 2 of other structures, FIG. 13 and 14 respectively.

  13A shows the bone conduction driver of the first embodiment shown in FIGS. 2 to 5 as Example 1, and FIG. 13B shows the second example shown in FIGS. The bone conduction driver of the embodiment, FIG. 14A is a bone conduction driver in which the plate body 50 as a metal cover is omitted from the bone conduction driver of the second embodiment as Comparative Example 1, FIG. Comparative Example 2 is a bone conduction driver described in Japanese Patent Application Laid-Open No. 2006-33787, and shows the results of measuring the exposure of each magnetic force. Each measurement result shows that the smaller the number of dots in the left semicircle in the figure, the smaller the amount of magnetic force exposed to the outside. In addition, the magnetic field lines are shown in the semicircle on the right side of the figure.

  As can be seen from FIGS. 13 and 14, in Example 1, the magnetic force exposed to the outside is remarkably smaller than the others, and the lines of magnetic force are almost converged. Therefore, it can be seen that the influence on the human body is also reduced. In Comparative Example 1, it can be seen that the leakage of magnetic force in the upward direction of the magnet is large and the efficiency is poor. Further, in the second embodiment, the leakage amount is reduced by the amount of the plate 50 placed thereon, and the amount of leakage is supplemented so as to go to the lower yoke side. Although there is a little leakage, an efficient magnetic circuit is maintained. Even in Comparative Example 2, there was leakage to the outside. As described above, in Examples 1 and 2 according to the present invention, there is little leakage due to the presence of the metal cover, the magnetism is converged to the base side, and an efficient magnetic circuit is formed, which is sufficient as a bone conduction microphone. It turns out that it can be used.

Explanatory drawing which shows the hands-free telephone call system which concerns on 1st Embodiment of this invention. The perspective view which similarly shows the bone conduction driver of 1st Embodiment. Sectional drawing which similarly shows a bone conduction driver. The disassembled sectional view which similarly shows a bone conduction driver. The disassembled perspective view which similarly shows a bone conduction driver. The block diagram which similarly shows the structure of the bone conduction microphone speaker connection apparatus of 1st Embodiment. The block diagram which similarly shows the structure of a portable call machine main body. The block diagram which similarly shows the structure of a PTT remote control device. Explanatory drawing which similarly shows the use condition of a hands-free call system. Explanatory drawing which shows the modification of a bone-conduction microphone and speaker communication apparatus. The disassembled perspective view which shows the bone conduction driver of 2nd Embodiment. (A) is a top view of a diaphragm similarly, (b) is sectional drawing. (A) Example 1 and (b) Magnetic force measurement results of Example 2. (A) is a magnetic force measurement result of Comparative Example 1 and (b) is a Comparative Example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bone conduction microphone / speaker communication device 2 Base 3 Voice coil 4 Diaphragm 4a Vibration area 4b Fixed area 5 Magnet 6 Metal cover 7 Lid 8 Phone body 9 Remote control device 10 Bone conduction driver 11a, 12a Case 11 Bone conduction Microphone 12 Bone conduction speaker 13 Radio unit 14 Control unit 14a Audio processing unit 15 Headband 20 Bottom surface 21 Pole screw 22 Fixing unit 23 Inner wall 24 Screw hole 25 Recess 26 Insulator 27 Terminal 40 Center position 41 Slot 42 Through hole 43 Mounting screw 44 End portion 45 End portion 46 Long groove 47 Plate member 50 Plate body 60 Through hole 61 Mounting screw 62 Covering portion 63 Fixed piece 70 Recessed portion 71 Screw hole 72 Mounting screw 72, 73 Split case 74 Mounting screw 80 Antenna 81 Transmission / reception changeover switch 82 Wireless Communication circuit 83 Control unit 83a Shin change processing unit 83b audio processing unit 84 button 85 Microphone 86 radio unit 87 adapter 90 radio unit 91 button 92 control unit 92a signal transmission processing section 92b audio processing unit 92c audio processing unit S handsfree system

Claims (5)

A bone conduction microphone / speaker communication device that is mounted on the user's head and transmits / receives audio data to / from the telephone body or its remote control device side,
Audio data is transmitted and received between the bone conduction microphone and bone conduction speaker comprising one or a pair of left and right bone conduction drivers arranged so as to be in contact with the periphery of the user's ear, and the telephone body or the remote control device side thereof. A short distance wireless communication unit for outputting a voice signal received from the telephone body or its remote control device through the short distance wireless communication unit to the bone conduction speaker, and a voice signal received from the bone conduction microphone for the short distance wireless communication Voice processing means for transmitting to the main body of the telephone or its remote control device through the unit,
A bone conduction driver that functions as at least the bone conduction microphone includes a base having a recess having a substantially circular bottom surface, a voice coil housed in the recess, and an inner wall of the recess in the base. A diaphragm attached to the fixed portion and provided over the voice coil housed in the recess, a magnet attached to a substantially central position on the upper surface side of the diaphragm, and disposed above the magnet A bone conduction microphone / speaker communication device comprising a metal cover and a lid provided above the metal cover.   Of the pair of left and right bone conduction drivers, one bone conduction microphone causes one to function as a bone conduction microphone and the other functions as a bone conduction speaker, and the other bone conduction driver to function as the bone conduction speaker functions as a bone conduction microphone. The bone conduction microphone / speaker communication device according to claim 1, wherein the bone conduction microphone / speaker communication device has the same structure as that of the driver.   2. The bone conduction microphone / speaker communication device according to claim 1, wherein the one bone conduction driver is switched to a bone conduction microphone / bone conduction speaker to function.   A voice coil in which a pole screw protruding upward from a substantially central portion of the bottom surface of the concave portion is provided integrally with the base using a metal material, the voice coil is disposed around the pole screw, and the inner wall surface of the concave portion is accommodated. The bone-conduction microphone / speaker communication device according to any one of claims 1 to 3, wherein the bone-conduction microphone / speaker communication device is formed into a curved surface substantially parallel to the outer peripheral surface.   The bone conduction according to any one of claims 1 to 4, wherein a pair of the fixing portions are provided at positions facing each other across the recess, and both end portions of the diaphragm are fixed to the upper surface of each fixing portion, respectively. Microphone / speaker communication device.

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